Single-shot read-out of a superconducting qubit using a Josephson parametric oscillator
Author(s)Krantz, Philip; Bengtsson, Andreas; Simoen, Michaël; Shumeiko, Vitaly; Wilson, C. M.; Delsing, Per; Bylander, Jonas; Gustavsson, Simon; Oliver, William D; ... Show more Show less
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We propose and demonstrate a read-out technique for a superconducting qubit by dispersively coupling it with a Josephson parametric oscillator. We employ a tunable quarter wavelength superconducting resonator and modulate its resonant frequency at twice its value with an amplitude surpassing the threshold for parametric instability. We map the qubit states onto two distinct states of classical parametric oscillation: one oscillating state, with 185±15 photons in the resonator, and one with zero oscillation amplitude. This high contrast obviates a following quantum-limited amplifier. We demonstrate proof-of-principle, single-shot read-out performance, and present an error budget indicating that this method can surpass the fidelity threshold required for quantum computing.
DepartmentLincoln Laboratory; Massachusetts Institute of Technology. Research Laboratory of Electronics
Nature Publishing Group
Krantz, Philip et al. “Single-Shot Read-out of a Superconducting Qubit Using a Josephson Parametric Oscillator.” Nature Communications 7 (2016): 11417. © 2017 Macmillan Publishers Limited
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